Wall clock time and date at job start Sat Apr 11 2020 06:10:36 AMSOL-version 7.1 by G. D. Hawkins, D. J. Giesen, G. C. Lynch, C. C. Chambers, I. Rossi, J. W. Storer, J. Li, J. D. Thompson, P. Winget, B. J. Lynch, D. Rinaldi, D. A. Liotard, C. J. Cramer, and D. G. Truhlar Copyright 2004 by Regents of the University of Minnesota. All rights reserved. Notice: recipients of this code are asked to comply with the user agreement in Section 1 of the documentation file. ******************************************************************************* * 1SCF - SCF CALCULATION WITHOUT GEOMETRY OPTIMIZATION * - USE EF ROUTINE FOR MINIMUM SEARCH (DEFAULT) * GEO-OK - OVERRIDE INTERATOMIC DISTANCE CHECK * TLIMIT= - A TIME OF 15. SECONDS REQUESTED * CHARGE - CHARGE ON SYSTEM= -1 * AM1 - THE AM1 HAMILTONIAN TO BE USED * DEV - DEVELOPER OPTIONS ARE ALLOWED * SM5.42R - SM5.42R CALCULATIONS WILL BE PERFORMED * - CHARGE MODEL 2 WILL BE USED (CM2A) * - THE SOLVENT IS USER-SPECIFIED * DIELEC - THE SOLVENT DIELECTRIC CONSTANT IS 2.06 * IOFR - THE SOLVENT INDEX OF REFRACTION IS 1.4345 * ALPHA - THE SOLVENT ALPHA IS 0.00 * BETA - THE SOLVENT BETA IS 0.00 * GAMMA - THE SOLVENT MACROSCOPIC SURFACE TENSION IS * 38.93 CAL MOL^-1 ANGSTROM^-2 * FACARB - THE FRACTION OF AROMATIC CARBONS IS 0.00 * FEHALO - THE FRACTION OF ELECTRONEGATIVE HALOGENS IS 0.00 ******************************************************************************* Atom NO. Chemical Bond length Bond angle Dihedral angle number (k) symbol (angstroms) (degrees) (degrees) (I) NA:I NB:NA:I NC:NB:NA:I NA NB NC 1 1 C 2 2 C 1.52997 * 1 3 3 O 1.42903 * 109.47409 * 2 1 4 4 C 1.42892 * 114.00364 * 179.97438 * 3 2 1 5 5 C 1.52999 * 109.47301 * 179.97438 * 4 3 2 6 6 O 1.42901 * 109.46788 * 65.00507 * 5 4 3 7 7 C 1.42902 * 113.99682 * 180.02562 * 6 5 4 8 8 C 1.50701 * 109.46974 * 179.97438 * 7 6 5 9 9 O 1.21281 * 120.00173 * 359.97438 * 8 7 6 10 10 N 1.34779 * 120.00262 * 179.97438 * 8 7 6 11 11 C 1.47168 * 125.64441 * 359.96860 * 10 8 7 12 12 C 1.55348 * 106.96398 * 180.98652 * 11 10 8 13 13 H 1.09001 * 112.91296 * 214.97053 * 12 11 10 14 14 C 1.53005 * 106.41671 * 91.60676 * 12 11 10 15 15 C 1.52589 * 111.00984 * 197.18485 * 14 12 11 16 16 C 1.53323 * 108.41195 * 62.37951 * 15 14 12 17 17 C 1.52833 * 108.09445 * 295.87340 * 16 15 14 18 18 H 1.08997 * 109.02542 * 298.41354 * 17 16 15 19 19 N 1.46498 * 109.02562 * 179.49696 * 17 16 15 20 20 C 1.36934 * 119.99800 * 85.00858 * 19 17 16 21 21 H 1.08000 * 120.00193 * 359.97438 * 20 19 17 22 22 C 1.38814 * 119.99953 * 179.97438 * 20 19 17 23 23 N 1.31613 * 120.00268 * 359.97438 * 22 20 19 24 24 Si 1.86806 * 119.99951 * 179.97438 * 22 20 19 25 25 H 1.48501 * 109.46894 * 60.00279 * 24 22 20 26 26 H 1.48494 * 109.47157 * 179.97438 * 24 22 20 27 27 H 1.48502 * 109.47179 * 300.00477 * 24 22 20 28 28 C 1.50739 * 111.73731 * 58.91733 * 17 16 15 29 29 H 1.09008 * 109.26310 * 186.93883 * 28 17 16 30 30 C 1.47797 * 125.62039 * 180.02562 * 10 8 7 31 31 H 1.09000 * 109.47263 * 179.97438 * 1 2 3 32 32 H 1.08994 * 109.47666 * 300.00586 * 1 2 3 33 33 H 1.09001 * 109.46883 * 60.00386 * 1 2 3 34 34 H 1.08994 * 109.47666 * 239.99414 * 2 1 3 35 35 H 1.09001 * 109.46883 * 119.99614 * 2 1 3 36 36 H 1.09005 * 109.47115 * 59.99706 * 4 3 2 37 37 H 1.08997 * 109.47578 * 300.00436 * 4 3 2 38 38 H 1.09000 * 109.47046 * 305.00438 * 5 4 3 39 39 H 1.09000 * 109.47104 * 185.00380 * 5 4 3 40 40 H 1.08993 * 109.47670 * 59.99321 * 7 6 5 41 41 H 1.09003 * 109.46758 * 299.99124 * 7 6 5 42 42 H 1.09005 * 109.96431 * 61.60978 * 11 10 8 43 43 H 1.08998 * 109.96591 * 300.36473 * 11 10 8 44 44 H 1.09002 * 109.16333 * 76.80459 * 14 12 11 45 45 H 1.09006 * 109.16179 * 317.56011 * 14 12 11 46 46 H 1.08999 * 109.67637 * 182.10928 * 15 14 12 47 47 H 1.09005 * 109.67607 * 302.64664 * 15 14 12 48 48 H 1.09000 * 109.74091 * 55.52454 * 16 15 14 49 49 H 1.08999 * 109.74050 * 176.23061 * 16 15 14 50 50 H 0.96996 * 120.00079 * 264.99664 * 19 17 16 51 51 H 0.97002 * 120.00292 * 180.02562 * 23 22 20 52 52 H 1.09001 * 110.59975 * 84.69616 * 30 10 8 53 53 H 1.08999 * 110.50047 * 321.92940 * 30 10 8 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 6 0.0000 0.0000 0.0000 2 6 1.5300 0.0000 0.0000 3 8 2.0064 1.3473 0.0000 4 6 3.4308 1.4601 0.0006 5 6 3.8254 2.9384 -0.0001 6 8 3.3976 3.5461 1.2205 7 6 3.7183 4.9349 1.3218 8 6 3.2230 5.4699 2.6407 9 8 2.6511 4.7344 3.4172 10 7 3.4154 6.7657 2.9574 11 6 4.0909 7.7639 2.1129 12 6 4.0933 9.1004 2.9046 13 1 3.9834 9.9743 2.2624 14 6 5.4012 9.1307 3.6980 15 6 5.3369 10.1634 4.8195 16 6 4.2235 9.7546 5.7911 17 6 2.8929 9.8181 5.0420 18 1 2.7191 10.8424 4.7126 19 7 1.8144 9.4190 5.9496 20 6 1.2445 10.3433 6.7839 21 1 1.5904 11.3664 6.7731 22 6 0.2222 9.9653 7.6435 23 7 -0.1997 8.7187 7.6564 24 14 -0.5547 11.2261 8.7822 25 1 -1.1510 12.3208 7.9752 26 1 -1.6154 10.5746 9.5919 27 1 0.4842 11.7853 9.6840 28 6 2.8851 8.9088 3.8398 29 1 1.9719 9.0758 3.2685 30 6 2.9837 7.4187 4.2111 31 1 -0.3634 -1.0276 -0.0005 32 1 -0.3634 0.5139 0.8899 33 1 -0.3633 0.5138 -0.8900 34 1 1.8934 -0.5139 -0.8899 35 1 1.8933 -0.5138 0.8900 36 1 3.8340 0.9764 -0.8892 37 1 3.8333 0.9767 0.8907 38 1 3.3499 3.4409 -0.8424 39 1 4.9082 3.0254 -0.0893 40 1 3.2404 5.4787 0.5070 41 1 4.7989 5.0637 1.2599 42 1 3.5478 7.8873 1.1759 43 1 5.1147 7.4490 1.9111 44 1 6.2216 9.3828 3.0261 45 1 5.5813 8.1456 4.1287 46 1 6.2908 10.1932 5.3460 47 1 5.1170 11.1459 4.4016 48 1 4.3985 8.7387 6.1452 49 1 4.2026 10.4415 6.6372 50 1 1.5039 8.5001 5.9595 51 1 -0.9143 8.4547 8.2569 52 1 3.7248 7.2693 4.9962 53 1 2.0116 7.0381 4.5246 RHF calculation, no. of doubly occupied orbitals= 66 REFERENCES FOR PARAMETERS IN GAS-PHASE HAMILTONIAN: H: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) C: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) N: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) O: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) Si: (AM1): M.J.S.DEWAR, C. JIE, ORGANOMETALLICS, 6, 1486-1490 (1987). REFERENCE FOR CHARGE MODEL 2: J. Li, J. Xing, C. J. Cramer, and D. G. Truhlar, J. Chem. Phys. 111 (1999) 885. REFERENCE FOR THE PARAMETERIZATION OF THE SM5.42R SOLVATION MODEL: J. Li, T. Zhu, G. D. Hawkins, P. Winget, D. A. Liotard, C. J. Cramer, and D. G. Truhlar, Theor. Chem. Acc. 103 (1999) 9-63 P. Winget, J. D. Thompson C. J. Cramer,and D. G. Truhlar, J. Phys. Chem. B. submitted. CHARGE=-1 AM1 1SCF TLIMIT=15 GEO-OK SM5.42R & SOLVNT=GENORG IOFR=1.4345 ALPHA=0.00 BETA=0.00 GAMMA=38.93 & DIELEC=2.06 FACARB=0.00 FEHALO=0.00 DEV ZINC001507370263.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sat Apr 11 2020 06:10:36 Heat of formation + Delta-G solvation = -118.732574 kcal Electronic energy + Delta-G solvation = -30457.978854 eV Core-core repulsion = 26329.867965 eV Total energy + Delta-G solvation = -4128.110889 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.71 seconds Orbital eigenvalues (eV) -40.54150 -39.02580 -38.30959 -37.13181 -35.40993 -33.83081 -32.15296 -31.56480 -30.86781 -29.77927 -28.98642 -27.52702 -26.40918 -24.20244 -23.35917 -23.01916 -22.83663 -21.69240 -20.76818 -19.41625 -18.41876 -17.53188 -17.23205 -17.11729 -16.64477 -16.25718 -16.00702 -15.59200 -15.36432 -14.81152 -14.64729 -14.46436 -13.93219 -13.79433 -13.68815 -13.56230 -13.24042 -13.09201 -12.83594 -12.69663 -12.66501 -12.29602 -12.22610 -11.89056 -11.71136 -11.70397 -11.51445 -11.29695 -11.20966 -11.05278 -10.97685 -10.81791 -10.69370 -10.21910 -10.16123 -9.97222 -9.92071 -9.84975 -9.69891 -9.60059 -9.48349 -8.83841 -8.45455 -6.92771 -5.71493 -3.01337 2.69444 2.74409 3.39514 3.46551 3.50821 3.52556 3.71697 4.44318 4.50202 4.60557 4.69375 4.79230 4.79916 4.84904 4.88994 4.92907 4.96361 5.03739 5.09753 5.10450 5.13964 5.29077 5.32746 5.37375 5.40977 5.44426 5.50795 5.60700 5.67276 5.68895 5.75828 5.78679 5.86072 5.91618 5.92413 6.04844 6.08904 6.27388 6.29333 6.36606 6.41664 6.51619 6.61366 6.75542 6.83100 6.93023 6.98823 7.13364 7.63550 7.72975 8.31919 8.46112 9.57077 10.14046 10.48239 11.50683 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.011702 B = 0.002404 C = 0.002044 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2392.239311 B =11646.693518 C =13698.631182 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.153 4.153 2 C 0.057 3.943 3 O -0.379 6.379 4 C 0.065 3.935 5 C 0.062 3.938 6 O -0.354 6.354 7 C 0.051 3.949 8 C 0.525 3.475 9 O -0.514 6.514 10 N -0.618 5.618 11 C 0.100 3.900 12 C -0.089 4.089 13 H 0.097 0.903 14 C -0.111 4.111 15 C -0.118 4.118 16 C -0.136 4.136 17 C 0.191 3.809 18 H 0.050 0.950 19 N -0.726 5.726 20 C -0.241 4.241 21 H 0.070 0.930 22 C -0.012 4.012 23 N -0.930 5.930 24 Si 0.905 3.095 25 H -0.287 1.287 26 H -0.292 1.292 27 H -0.287 1.287 28 C -0.095 4.095 29 H 0.077 0.923 30 C 0.119 3.881 31 H 0.069 0.931 32 H 0.067 0.933 33 H 0.061 0.939 34 H 0.045 0.955 35 H 0.049 0.951 36 H 0.064 0.936 37 H 0.059 0.941 38 H 0.059 0.941 39 H 0.066 0.934 40 H 0.078 0.922 41 H 0.076 0.924 42 H 0.065 0.935 43 H 0.067 0.933 44 H 0.056 0.944 45 H 0.061 0.939 46 H 0.054 0.946 47 H 0.059 0.941 48 H 0.056 0.944 49 H 0.063 0.937 50 H 0.384 0.616 51 H 0.256 0.744 52 H 0.072 0.928 53 H 0.085 0.915 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 13.495 -9.757 -20.570 26.465 Note: The Mulliken population analysis charges presented below were not used in the solvation calculation but are provided for completeness. The chosen solvation model uses CM2 partial charges for calculating solvation energies. Net atomic charges, atomic populations, and dipole contributions using Mulliken population analysis Atom NO. Type Charge No. of electrons 1 C -0.210 4.210 2 C -0.019 4.019 3 O -0.299 6.299 4 C -0.011 4.011 5 C -0.015 4.015 6 O -0.272 6.272 7 C -0.029 4.029 8 C 0.311 3.689 9 O -0.388 6.388 10 N -0.355 5.355 11 C -0.024 4.024 12 C -0.109 4.109 13 H 0.115 0.885 14 C -0.149 4.149 15 C -0.156 4.156 16 C -0.176 4.176 17 C 0.081 3.919 18 H 0.068 0.932 19 N -0.367 5.367 20 C -0.372 4.372 21 H 0.088 0.912 22 C -0.209 4.209 23 N -0.578 5.578 24 Si 0.737 3.263 25 H -0.213 1.213 26 H -0.218 1.218 27 H -0.213 1.213 28 C -0.115 4.115 29 H 0.095 0.905 30 C -0.002 4.002 31 H 0.088 0.912 32 H 0.086 0.914 33 H 0.081 0.919 34 H 0.063 0.937 35 H 0.067 0.933 36 H 0.082 0.918 37 H 0.078 0.922 38 H 0.078 0.922 39 H 0.084 0.916 40 H 0.096 0.904 41 H 0.094 0.906 42 H 0.083 0.917 43 H 0.086 0.914 44 H 0.075 0.925 45 H 0.080 0.920 46 H 0.073 0.927 47 H 0.078 0.922 48 H 0.075 0.925 49 H 0.082 0.918 50 H 0.219 0.781 51 H 0.066 0.934 52 H 0.091 0.909 53 H 0.103 0.897 Dipole moment (debyes) X Y Z Total from point charges 12.842 -10.087 -19.920 25.758 hybrid contribution -0.161 0.301 0.390 0.518 sum 12.681 -9.786 -19.529 25.258 Atomic orbital electron populations 1.21741 0.93634 1.02137 1.03463 1.22457 0.95868 0.83791 0.99799 1.87999 1.20272 1.26262 1.95345 1.22473 0.82535 0.95289 1.00842 1.22583 0.98272 0.92942 0.87676 1.88106 1.80731 1.20766 1.37577 1.22164 1.00124 0.84317 0.96333 1.19789 0.80275 0.80770 0.88016 1.90775 1.40838 1.56064 1.51122 1.48582 1.58359 1.08041 1.20516 1.22424 0.96790 0.89060 0.94094 1.22250 0.95902 0.95884 0.96840 0.88522 1.21558 0.95785 1.00146 0.97390 1.21530 0.99017 0.98428 0.96654 1.22322 0.95617 1.01329 0.98371 1.19564 0.88526 0.95735 0.88065 0.93166 1.42517 1.39509 1.10690 1.44034 1.19166 1.13063 0.91421 1.13550 0.91241 1.24750 0.99524 0.96276 1.00306 1.69651 1.31240 1.15690 1.41238 0.86300 0.78833 0.80474 0.80736 1.21345 1.21755 1.21330 1.21774 0.97673 0.94451 0.97617 0.90493 1.22178 1.01304 0.91428 0.85294 0.91184 0.91439 0.91946 0.93703 0.93316 0.91829 0.92247 0.92236 0.91648 0.90432 0.90619 0.91694 0.91429 0.92486 0.92003 0.92728 0.92176 0.92487 0.91781 0.78132 0.93402 0.90939 0.89678 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 14. Note: The number of geometries may not correspond to the number of cycles due to rejected geometry changes. In the following table subtotal= G_P + SS G_CDS. Atom Chem. CM2 G_P Area Sigma k SS G_CDS Subtotal M number symbol chg. (kcal) (Ang**2) cal/(Ang**2) (kcal) (kcal) value 1 C -0.15 -1.29 10.28 37.16 0.38 -0.91 16 2 C 0.06 0.52 6.66 37.16 0.25 0.76 16 3 O -0.38 -4.56 10.31 -40.09 -0.41 -4.97 16 4 C 0.07 0.59 6.32 37.16 0.23 0.83 16 5 C 0.06 0.57 6.32 37.16 0.23 0.80 16 6 O -0.35 -4.91 9.84 -59.73 -0.59 -5.50 16 7 C 0.05 0.59 5.61 36.01 0.20 0.79 16 8 C 0.52 8.55 7.93 -10.98 -0.09 8.46 16 9 O -0.51 -11.11 16.78 -14.35 -0.24 -11.35 16 10 N -0.62 -9.05 3.34 -170.09 -0.57 -9.61 16 11 C 0.10 1.04 5.79 -2.43 -0.01 1.02 16 12 C -0.09 -1.02 3.61 -88.86 -0.32 -1.34 16 13 H 0.10 0.94 8.14 -51.93 -0.42 0.52 16 14 C -0.11 -1.23 4.63 -26.94 -0.12 -1.36 16 15 C -0.12 -1.50 5.93 -26.77 -0.16 -1.66 16 16 C -0.14 -2.31 5.36 -26.65 -0.14 -2.45 16 17 C 0.19 3.59 2.46 -69.15 -0.17 3.42 16 18 H 0.05 0.97 8.06 -51.93 -0.42 0.55 16 19 N -0.73 -17.86 5.01 -54.62 -0.27 -18.14 16 20 C -0.24 -6.61 9.91 -15.06 -0.15 -6.76 16 21 H 0.07 1.84 7.83 -52.49 -0.41 1.43 16 22 C -0.01 -0.35 5.50 -17.43 -0.10 -0.45 16 23 N -0.93 -28.58 13.06 55.49 0.72 -27.86 16 24 Si 0.91 22.56 29.55 -169.99 -5.02 17.53 16 25 H -0.29 -7.01 7.11 56.52 0.40 -6.61 16 26 H -0.29 -7.37 7.11 56.52 0.40 -6.97 16 27 H -0.29 -7.01 7.11 56.52 0.40 -6.61 16 28 C -0.10 -1.50 2.49 -90.78 -0.23 -1.73 16 29 H 0.08 1.30 8.14 -51.92 -0.42 0.88 16 30 C 0.12 2.06 5.06 -2.87 -0.01 2.05 16 31 H 0.07 0.44 8.14 -51.93 -0.42 0.02 16 32 H 0.07 0.67 8.14 -51.93 -0.42 0.25 16 33 H 0.06 0.52 8.14 -51.93 -0.42 0.10 16 34 H 0.04 0.31 8.14 -51.93 -0.42 -0.11 16 35 H 0.05 0.42 8.14 -51.93 -0.42 -0.01 16 36 H 0.06 0.39 8.14 -51.93 -0.42 -0.04 16 37 H 0.06 0.55 8.14 -51.93 -0.42 0.13 16 38 H 0.06 0.49 8.14 -51.93 -0.42 0.06 16 39 H 0.07 0.41 8.14 -51.93 -0.42 -0.02 16 40 H 0.08 0.73 8.14 -51.93 -0.42 0.31 16 41 H 0.08 0.64 8.14 -51.93 -0.42 0.22 16 42 H 0.06 0.57 8.14 -51.93 -0.42 0.15 16 43 H 0.07 0.56 7.74 -51.93 -0.40 0.16 16 44 H 0.06 0.51 8.14 -51.93 -0.42 0.09 16 45 H 0.06 0.75 7.15 -51.93 -0.37 0.38 16 46 H 0.05 0.64 8.14 -51.93 -0.42 0.22 16 47 H 0.06 0.73 8.14 -51.93 -0.42 0.31 16 48 H 0.06 1.02 6.80 -51.93 -0.35 0.67 16 49 H 0.06 1.20 8.14 -51.93 -0.42 0.78 16 50 H 0.38 10.23 6.45 -40.82 -0.26 9.97 16 51 H 0.26 7.67 8.31 -40.82 -0.34 7.34 16 52 H 0.07 1.30 6.15 -51.93 -0.32 0.98 16 53 H 0.08 1.77 7.43 -51.93 -0.39 1.39 16 LS Contribution 415.53 15.07 6.26 6.26 Total: -1.00 -35.66 415.53 -9.99 -45.65 By element: Atomic # 1 Polarization: 16.17 SS G_CDS: -9.67 Total: 6.50 kcal Atomic # 6 Polarization: 1.69 SS G_CDS: -0.20 Total: 1.48 kcal Atomic # 7 Polarization: -55.49 SS G_CDS: -0.12 Total: -55.61 kcal Atomic # 8 Polarization: -20.58 SS G_CDS: -1.24 Total: -21.82 kcal Atomic # 14 Polarization: 22.56 SS G_CDS: -5.02 Total: 17.53 kcal Total LS contribution 6.26 Total: 6.26 kcal Total: -35.66 -9.99 -45.65 kcal The number of atoms in the molecule is 53 The average number of expansion shells was 16.00 The maximum number of expansion shells was 16 The minimum number of expansion shells was 16 **** NOTA BENE **** This is the net solvation energy for this exact molecular structure (nuclear and electronic)! The standard-state solvation energy should be obtained as the difference between the heat of formation plus delta-G solvation for the relaxed solvated system and that for the relaxed gas-phase system. ZINC001507370263.mol2 53 1SCF run This is a breakdown of the solvation energy calculated without geometric relaxation in solution: (1) E-EN(sol) electronic-nuclear energy of solute -73.085 kcal (2) G-P(sol) polarization free energy of solvation -35.655 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -108.740 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.992 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -45.647 kcal (6) G-S(sol) free energy of system = (1) + (5) -118.733 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.71 seconds